基于到达时差法的雷电定位系统2维定位误差分析

Two-dimensional Location Error Analysis of Lightning Location System Based on Difference of Time-of-arrival Method

定位精度是评价定位网络的重要指标之一。为分析雷击定位网络不同位置的定位误差,通过几何模型对重庆地区的一套雷电定位网络的定位误差进行分析;并采用基于"随机数"的Monte Carlo法对网络覆盖区域的定位精度进行模拟,验证了几何模型所得结果的正确性。结果表明,当辐射源位于定位网络内时,水平方向的误差<100m;当辐射源位于定位网络外时,定位精度与辐射源距离r以及定位网络的几何尺寸D有关;水平方向的误差与r2成正比,与D2成反比;方位角误差与r成正比,与D成反比。

Location accuracy is an important index for evaluation of locating networks. In order to understand the location error of radiation sources in different areas of lighming locating networks, we analyzed the location error of the lightning location network in Chongqing, China through geometrical models. The results of geometric models were verified by the location accuracy which was simulated using the Monte Carlo method based on the ＂random＂. It is indicated that, with a radiation source located in the network, the horizontal error is less tan 100 meters. However, when the radiation source is located outside the network, the location accuracy is related to r, the distance from the radiation source and D, the net- work＇s geometry size. The horizontal error increases with r2 proportionally and decreases with D2proportionally, while the azimuth error increases with r proportionally, and decreases with D proportionally.